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Old 09-15-2015, 09:44 PM
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2014 JKUR ran hot today (one time)

Hi all,

We have a 2014 Rubicon with 27k. It has never missed a beat since day one but today it ran hot when my wife took our son school. Gauge neared red and the over-temp light came on. I let it cool down, checked the coolant and overflow bottle, fan fuse, etc. Started it back up, cycled the a/c on and off, cooling system pressure (hose squeeze), all the basics. We drove it around all afternoon and it was fine. Are we talking stuck t-stat here? Any one else experience this?

Jeep Dealer put a new battery in it on Saturday. Fan control issue? Relearn?

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Old 09-15-2015, 09:53 PM
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Old 09-15-2015, 09:55 PM   #3
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Can you hear your fan coming on when it's hot ?


Had problems with my '13, it overheated a couple of times, ran it into the dealer and they changed the fan motor and the TIPM, was ok for a day or two then did it again, ended up being a bad solder joint at the fusible link for the fan. If it got hot enough it would expand the joint and the fan wouldn't turn on, a little cooler and it was fine.
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Old 09-15-2015, 10:18 PM
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The fan comes on/off with the a/c when below operating temp. When the gauge is pointing straight up the fan is on and stays on. Again, I could not duplicate the problem today. I know the fan comes on but maybe fan speed is a problem? The trip to our son's school is mostly back roads, no sitting at stop lights. Even without the fan I wouldn't think it would get too hot at 7:30am.
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Old 09-15-2015, 10:25 PM   #5
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I'm not sure of the temps that it comes on at but the fan does have a HI and LO speed, if it's only operating in LO it could be a bad temp sending unit, relay, thermostat, TIPM or a few other things. I'd monitor it and give your Jeep dealer as much info as possible when you take it in.
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Teraflex suspension 2.5" lift, Falcon 2.1 shocks, Goodyear Wrangler MTR Kevlar 35 x 12.5 x 17, Warn Zeon 10, Metal Cloak Overland Fenders. Lots of other stuff.
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Old 09-15-2015, 10:43 PM
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I'm not sure of the temps that it comes on at but the fan does have a HI and LO speed, if it's only operating in LO it could be a bad temp sending unit, relay, thermostat, TIPM or a few other things. I'd monitor it and give your Jeep dealer as much info as possible when you take it in.
I've heard it ramp from low to high speed. Hopefully I'll be the one to catch it in the act next time.
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Old 09-17-2015, 04:25 PM
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Several days later and the problem has not returned. I'm thinking at this point it must have been a stuck t-stat.
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Old 09-17-2015, 05:49 PM   #8
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Originally Posted by dryheat View Post
Several days later and the problem has not returned. I'm thinking at this point it must have been a stuck t-stat.
I agree with you, from what you have stated, it sounds like your Thermostat may have stuck.

Once that your cooling system has cooled down, then I would remove the radiator cap and see if your coolant looks like it has some sludge in it. I would also pull the overflow bottle and look for sludge debris in the bottom of it. If this is floating around in your cooling system, then that may have contributed to your stat sticking.
This sludge, has been come from stop leak being added at the factory. It has been a issue for some on the Forum.
Please let us know what you find!!!!

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Old 09-17-2015, 05:55 PM   #9
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Mine will get hot(er) on long up hills where I use high RPMs at the same time. I have a winch in front, air dam removed, poison spyder front bumper and under skid. I brought it to the dealer and they ended up replacing both heads. Still does the same thing just not quite as bad. I have never had it get hot enough to trip the light even before I brought it to the dealer the first time. Considering your ambient conditions I don't think it was something like a leak. Stuck thermostat is the best thing I can think of also. Seems weird to me that it can get so hot once when not under strenuous conditions and then you can't reproduce it at all.

I definitely agree with old dogger above though. There are definitely some cooling system issues with these and they often start with sludge. Have a look for that first. Mine has none and the heat works great. I don't think that's my issue. I think it's my reduced airflow or the fan not stepping into high.
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Old 09-17-2015, 06:22 PM   #10
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Several days later and the problem has not returned. I'm thinking at this point it must have been a stuck t-stat.
It's possible. What Old Dogger mentioned could be the issue. The thermostat opens at 203 degrees. It sounds like it didn't initially open. If you see any sludge in the system, take it in.
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Old 09-17-2015, 06:38 PM   #11
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Originally Posted by Wharfrat View Post
Mine will get hot(er) on long up hills where I use high RPMs at the same time. I have a winch in front, air dam removed, poison spyder front bumper and under skid. I brought it to the dealer and they ended up replacing both heads. Still does the same thing just not quite as bad. I have never had it get hot enough to trip the light even before I brought it to the dealer the first time. Considering your ambient conditions I don't think it was something like a leak. Stuck thermostat is the best thing I can think of also. Seems weird to me that it can get so hot once when not under strenuous conditions and then you can't reproduce it at all. I definitely agree with old dogger above though. There are definitely some cooling system issues with these and they often start with sludge. Have a look for that first. Mine has none and the heat works great. I don't think that's my issue. I think it's my reduced airflow or the fan not stepping into high.
Same, I just left Moab and both coming and going when you're hauling along at 80 climbing hills at 4500 rpm in 90 degree weather the thing gets hot ( lol) . I have a high mount winch too. I saw it get to 244 three or four times, but no ill effects. Just driving around town or idling or trails or whatever it never gets over about 230. I'm not sure what temp trips the warning light, I would imagine about 250.
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Old 09-17-2015, 09:16 PM
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I did check the radiator and coolant overflow bottle when this happened but wanted to be sure so I just checked again. No evidence of sludge or stop-leak around/on the radiator cap or in the bottle. Coolant looks perfect and the level is right on. I have an LS powered vehicle so I'm familiar with the coolant sludge from "seal pellets".

I going to buy a new t-stat (Mopar I guess?) and keep it on standby. I'd really like to catch it in the act.

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